select c_id,sum(c_amount)
from tb_o_sg
where c_datetime>='2011-7-27' and c_datetime<='2011-8-2' and c_amount>0
group by c_id having sum(c_amount)>0 and sum(c_amount)<25
order by sum(c_amount) asc

6009413    5.00
6009037    5.00
6009206    5.00
6009211    8.00
6009372    10.00
6009183    11.00
8006885    16.00
6009344    16.00
2009938    16.00
8007342    18.00
8007474    18.00
6009314    19.00
8006745    20.00
8007060    20.00
8006880    20.00
8007307    20.00
8006889    20.00
2009976    20.00
8007498    20.00
8007226    20.00


请问怎么在查询后的数据再加一行求和呢？